安徽省几座老坝倒垂观测设施的更新改造

较早修建的大坝，由于当时的认识水平和施工条件的限制，大坝安全监测系统存在不少问题，特别是倒垂观测设施存在的问题更多。文章结合安徽省几座大坝倒垂观测上存在的问题和更新改造的实践，论述了对老坝增设和改造原有倒垂的必要性；并介绍倒垂的检查、改造设计、施工中保证钻孔垂直度等方面的经验及应注意的问题。

REFORMATION OF SEVERAL INVERTED PLUNB LINES FOR OLD DAMS IN ANHUI

For old dams, because of the limited knowledge and construction level in those years, there existed many problems in the monitoring system, especially inverted plumb lines. Based on the experiences in reformation of the monitoring systems at several old dams in Anhui, this paper describes the necessity of reformation and some experiences, and points out the problems which should be paid attention to in inspection, design, and construction in the process of reformation of inverted plumb lines.